There doesn't need to be a hardware change, and companies are already offering such devices. Even in Apple's own online store: https://www.apple.com/shop/produc

There doesn't need to be a hardware change, and companies are already offering such devices. Even in Apple's own online store: https://www.apple.com/shop/product/HKPB2VC/A/gamevice-controller-for-iphone-and-iphone-plus https://www.apple.com/shop/product/HKPB2VC/A/gamevice-contro...